Abstract
We propose a simple self-polarization-stabilization technique for the
wavelength-division-multiplexed passive optical network implemented with
reflective semiconductor optical amplifiers (RSOAs) and self-homodyne
coherent receivers. By placing a 45$^{\circ}$ Faraday rotator in front of the RSOA in the optical network unit,
the state-of-polarization of the upstream signal becomes orthogonal to that
of the linearly polarized seed light at the input of the coherent receiver
regardless of the birefringence in the transmission link. Thus, we can
achieve the polarization stability of the upstream signal at the input of
the coherent receiver. We first implement a self-homodyne receiver by using
the proposed self-polarization-stabilization technique and measure its
sensitivity by using 2.5-Gb/s binary phase-shift keying signals in the
laboratory. The result shows an excellent receiver sensitivity of ${-}46.4$ dBm. We also confirm the efficacy of the proposed technique in
the transmission experiment over 68-km long link partially composed of
installed (buried and aerial) fibers. No significant degradation in the
receiver sensitivity is observed during the 10-h experiment despite the
large polarization fluctuations occurred in these installed fibers.
© 2011 IEEE
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